/*
 * Copyright 2024 Netflix, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.mantisrx.control.controllers;

import io.mantisrx.control.IController;

public class Derivative extends IController {

    private double last = 0;
    private boolean initialized = false;

    @Override
    protected Double processStep(Double input) {

        if (initialized) {
            double output = input - last;
            this.last = input;

            return output;
        } else {
            return 0.0;
        }
    }
}
